One problem related to brake loud noise has been reported for the 2010 Toyota Prius. The most recently reported issues are listed below.
Driving at very slow speed. . . Braking at stop sign behind another car; needed to hit the brakes--not quite "slam on the brakes" --as I realized I was closer to car in front of me than I'd thought. Car in front of me pulled away at the same time (fortunately) as my car lurched forward; I didn't feel it was going to stop; when I then proceeded car made horrible noises. . . Sounded I thought bottom was going to fall out. Have experienced the same "not going to stop" feeling a second time since. What followed? called dealership immediately; they suggested I come in for brake check, which I did following day. Told it was going to cost $125; we discussed likelihood that problem probably wouldn't happen for the mechanic, I decided against spending money for brake check up when service dept. Told me it was "just the way Prius' abs brakes work. " when I asked about the news reports I'd heard about this braking problem they didn't know anything about it, pointed to absence of info on Toyota's website for service departments and said media often blows things out of proportion. Called Toyota corp and case manager that returned call to me had no information about media reports I referred to.